FUEL SYSTEM
CS-600
33
4-8 Testing carburettor
NOTE:
To perform this test, carburettor interior
should be wet with fuel. If dry, a little leakage may
occur from diaphragms and/or inlet needle seat.
1. Remove cleaner lid, air fi lter and cleaner case.
Disconnect fuel line from carburettor. Connect
Pressure tester 897803-30133 (A) to carburettor
fuel inlet.
2. Apply pressure approx. 98 kPa (1 kgf/cm
2
) (14
psi).
3. If pressure remains steady, follow step 4 and 5.
If pressure drops, proceed to step 6.
4. Pull starter grip. Pressure tester reading should
drop and remain above 49 kPa (0.5 kgf/cm
2
) (7
psi).
5. If reading does not drop, inspect inlet needle
valve for sticking or metering lever height is too
low.
6. If pressure drops at step 2, or if pressure drops
below standard fi gure at step 4, remove carburet-
tor from the unit, disconnecting pulse line, throttle
rod and choke knob.
7. Submerge carburettor in suitable clean solvent
to locate the leak by applying pressure approx. 98
kPa (1 kgf/cm
2
) (14 psi).
8. If air bubbles come out between pump cover
and carburettor body (B), inspect pump diaphragm,
pump gasket, and diaphragm seat of carburettor
body (Refer to “4-13 Inspecting diaphragm”).
9. If air bubbles come out from throttle bore (C),
inspect inlet valve, metering lever spring, and me-
tering lever height (Refer to “4-11 Inspecting inlet
needle valve”).
A
B
C
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